We describe a multilevel intervention to enhance adoption of point-of-care HIV and diabetes testing at church health fairs in Atlanta, Georgia. Church leaders viewed a leadership video and subsequently conducted social activities that support testing. After the multilevel intervention, a third of churches hosted HIV and diabetes health fairs, and church leaders engaged in more social activities. Of 193 attendees receiving health services, 56.6% received HIV testing and 92.7% received diabetes testing. This implementation science approach could reduce HIV and diabetes disparities among African Americans.